Concrete mixer



Aug. 8, 1933. F. E. MASCETTI ET AL 1,921,635

CONCRETE MIXER Filed May 18, 1932 INVENTOR Frederick E.Mascetti.

21 Americas D-Bvuno.

' ATTORNEY Patented Aug. 8, 1933 LcoNcnE'rE'mxEn p p Fredrich EnMasctti and Amer-ions D. Bruno, I I v I Torrington, Conn.

.4 Application May18,-193 2. Seriai 1o.612,019 v v I a m. (6148973)] This invention relates to concrete mixers, and more particularly to a rotary drum type of f concrete mixer divided into two compartments.

One object of this inventionis to provide a concrete mixer of the above nature having two compartments, so that the raw or unmixed ma-v terial may be placed in the first drum and'mixed, .while at the same time the material in the second drum may be mixed and delivered, thuSre- 'ducingthe required time of properly preparing concrete or other mixed ingredients about one half.

A further object is to 'provid'ea mixer of the above naturehaving' a novel means located upon the dividing partition ofthe'drum for transferring'the'ingredients from the first comparte 1 merit to the second compartment while the drum is being rotated, A-further object is to provide an appa'ratus of the above nature having means on thecen- 'tral partition to prevent any lot the] mixture from falling back into the first mixing' compartmerit j 'Afurther objectis to provide a concrete mixer of the above nature which will be'simp'le in construction, inexpensive to. manufacture easy toassemble and manipulate compactfand very efiicient and durable in use? p With" these and other objects in view there has been illustrated on the accompanying draw- 5 ing, one form' in which the invention conveniently embodied in practice. In the drawing: Fig. 1 represents a longitudinal vertical'sec tional viewfof a concrete" mixer embodying the invention; r '.Fig. 2 is a transverse 'sec'tionali view of the same; takenalong the line 2-2 of Fig.1 1,lo'ok m I be ing in the directionpf the arrows. v a

3 is a detail fragmentary sectionalfview of the water-.proof -ball bearing constructionfor supporting the central div erter spent and splash guard.

Referring now [the drawing' in which "like reference numerals denote corresponding parts throughout the several. views, the numeral 10 indicates a'rotary mixing'drum whichis divided into two separate compartments by meansof an annular central partition 11,thus forming a preliminary jo'r receivingflmixing chamber 12 and a finalorfdelivery mixingcha'mber 13.

' In order to .rotatably support the drum it has afpair of peripheral flangesyl i and '15 adjacent the front. and rear end walls, 16 and '17 thereof saidiflainges beingj adapted to rest upon thereof; *Theopposite ends'of the shafts 19 a 20" are suitably journaled inpillow blocks 21 supported upon a truck frame 22; The-frame 122' is'prefera bly mounted on wheels 23 so that" the concrete mixer can be conveniently rolled around from place to. place. I I

The drum 10 is adapted to receive'its rotary Y motion by'means' of an annul'ar gear or rack '24 j surrounding the central part of the drum'lO and engaging a: driving pinion 25 keyed to a driven horizontah'shaft 26' located un'derneathi said *drurnf The rear end offthe. driven shaftiZG, is jour'naled in a 'hanger bearingqZTdepending froma cross-channeriron 28 supported uponthe l truck frame 22.'J Thefront end of the driving M shaft 26 may be connected toanyfsuitable source'ofapower, such as an internal combustionj engine or electric motor (not shownh I v p The raw materials or ,ingredients ;for* making concrete may" be placed in the receivingf"mixing member-' 2, by means-of an inclinedfchute 29, projecting through a flanged opening 30 p 1 formedin'the'center of the front end wal1f' f6r and'said ingredients" are mixed in said chamber:

12 by means of a plurality {ofdongitudinally exa tending mixingscoops or buckets 31 angularly disposedwithin theichamber'l2; and tending. to I I deflect the mixture towardsl the rear bfg ai dlw chamber' l2.

Y rm order to'shift the concrete mat-trench! the'"receiving chamber 12 to the fdeliveryf mixing chamber 13, provision ismade of an arcua'te shaped transferring chute-for gate'ifizf pivo'tally journaled upon a pairof alined shafts 33 andfiwhich are threaded on their inner ends and screwed into an expansionfnut35, which nupmmn ns similarly to' atturn buckle; The chute 32,- as shown inFig; 1', is'adap ted to pro-5' iect partly within both'chambers'12 and 13,the 1 7 forward endof said chute 32 within thedelivery chamber, having an"arcuate-shape'd inverted cover guard 36 securely attachedto said'chute;

as by riveting. The cover guard 36 prevents any off the concrete mixture in ,theffdelivery Tchainber. from falling into the" chutelji32, and from; being thereby tra'nsferred: back into the V receiving chamber. 1

' yIn order tqps'upportthe chute 32 a "sition' within the drum 10,1preventing saidc'hute 32 from rotating with said drum 10, theshafts '33 and 34, upon whichlsaidi'chute 32 is pivotally supported, areprovided upon their opposite ex-' I j tremities with a pair of enlarged integral square shanks 37 and 38 engaged in similar shaped sockets formed in the inner periphery of the inner race 39 of a large water-proof ball bearing 40 mounted in the center of the partition 11, as shown in Fig. 1. The water-proof ball bearing 40 comprises an inner race 39, an outerrace 41, and a series of equally spaced balls 42 adapted to move freely ina raceway 42a. The outer race 41 is adapted to be fitted within an annular seat 43 formed in an enlarged flanged rim 44 on the i in the chamber 13 for a similar period of 37% seconds, .and during this period, a fresh batch edge of the aperture in the partition 11, and said race 41 is held in said seat 43 against lateral movement by means of an annular retaining ring 45 secured to the rim 44, as by screws 46.

To retain lubricant within the 'ball bearing raceway 42a and also to prevent theaccess of water thereto, provision is made of a pair-of an nular packing rings 47 and 48, preferablymade of compressed water-proof felt and located on opposite sides of the ball bearings 42 (see Fig. 3 The packing rings 47 and 48 are held in I place by means of a pair of offset annular rims 49 and 50, and said packing rings 47 and 48 are preferably permanently secured to said rims 49 and 50, as by means of aplurality of rivets 51. The rims 49 and 50 are provided on their outer edges with integral inturned flanges 52 and 53 which are adapted tobe slipped uponthe shoulder' formed in the outer race 43 and secured thereto, as by screws 54, as clearly v shown in Fig. 3. V I

To swing thechute from the position shown in full lines to the diverting position shown in dotted lines in Fig. 1, provision is Imade of a rod 55having a right-angle bend 56 atits inher end pivotally journaledin a lug 57 attached tothe rear upper edge of the cover guard 36. The, rod 55 extends through a flanged discharge I so opening 58 formed in the rear or delivery wall 17 of the. drum 10, and is provided with a suitable handlemember 59 for convenience in ma nipulation. The outer operating end of the rod 55 issupported in a loop bracket 60 secured to one of a pair of standards 61 mounted upon the rear. extremity of the truck frame 22. If desired, the underside of the rod 55 adjacent the handle 'member 59 may be provided with a seriesof saw-toothed notches 62, adapted to be engaged by catch means '(not. shown) formed ;in the bracket 60 for'the purpose of locking the transferring chute in any adjusted slanting position. It will be obvious from this construction that the chute 32, which is supported by the inner race39 oftheball bearing 40, will be held against rotation by means of the rod 55,

. since said rod -.is secured to the stationary standard '61 outside of the rotating drumlO. H

After the ingredients have been transferred from the chamber 12 to the chamber 13 by means of the chute 32,.the mixture will be again agitated by a. plurality of mixing scoops 63 angularly, disposed on the inner wallof said cham-' ,ber'13.

When the mixing of the concrete has been completed, it may be discharged from the delivery chamber 13" through the opening 58 by means of a discharge chute 64 supported upon a .j pairof swinging straps 65 which are pivotally journaled at their upper ends to a cross shaft 66, said shaft 66,,being suspended between the upper ends of the standards 61.

Operation In operation, 'when the driving mechanism has been started to rotate the drum 10, the ingredients tobe mixed may be introduced'into the receiving mixing chamber by means of the,

material falling from the scoops 31 will slide into the delivery mixing chamber '13, the time required for thisshifting operation being about 10 seconds. The mixture will then be agitated of. ingredients will be introduced into the chamber 12. The completely mixed concrete may be readily discharged from the chamber 13 by merely swinging the chute 64 inwardly throughthedischarge opening 58 to the position shown in Fig. 1. This will cause the particles of the concrete mixture falling from the scoops 63 to be caught by said chute 64 and deflected out .of the machine.

From this constructiomit will be obvious that fully mixed concrete -may' be produced by the present improved apparatus in approximately one-half. the time formerly required to thoroughly commingle it with the oldtyp'e of single compartmentdrums, where it was necessary to wait the full time required for completely mix ing before the batch of concrete 'could be dis& charged.

its

While there has been disclosed in this spcifi- I cation one form in which the invention' may be embodied, it is to be understood that this form a is shown for the purpose of illustration only, and that the invention is not to be limited to the specific disclosure but may be modified and em} bodied in various other forms without departing from its spirit. In short, the invention includes all the modifications and embodiments. coming within the scope of the following claims.

Havingthus' 'fully described the invention, what is claimed as new and for which it is desired to secure LettersjPatent is: f

1. In aconcrete mixer, a rotary hollow :drum having inlet and outlet openings, a partition integral with said drum and having an opening therein, said partition dividing said'drum into two compartments, means in said compartments for agitating the concrete mixture, a transfer chute pivotally'supported by said partition and extending through said opening,a guard member attached to, said. chute to prevent said mixture, from falling back from, the second to the first compartment, a rod connected to said guard member for tilting said chute into operating position, and means for locking said rod in any ring for transferring concrete through said.

opening, means for swinging 'saidchutejinto' injoperative position, and means connected to said frame and said chute for preventing the rota- ;tion of thelatter.

3. In a concrete mixer, a rotary hollow drum.

having inlet and outlet openings, a .partitionlocated within said drum and having an opening therein, a ball bearing. raceway mount'ed'in' said opening, a chute pivotally'mounted in said'rac'e way for transferring concrete .through said opening, means forswin'ging said chute into'inchambers, said partitionhaving an opening, a,

ball bearing mounted in said opening, a chute pivotally supported in said ball bearing for transferring concrete from said receiving to said delivery chamber, means secured to said b'ase' and rigidlyconnected'to the pivotal' support of saidchute for swinging it aboutits axis and, v

locking it "in'position, said means being adapted to prevent said chute from rotating, a'guard member attached tosaidchute tofprevent the mixed ingredients from passing back from the delivery to the receiving chamber, and means v a s' ng the mixed material from said delivery chamber. i a

a FREDERICK E. MASCETTI.

'AMERICUS D.;BRUNO.Q I V 

